Fontes is a civil parish in the municipality of Santa Marta de Penaguião, in the northern Douro region of Portugal.

[2] An old parish, its history dates to a period when a vicarage under the Commander of Comenda and Order of Malta dominated the region.

Most of the parish's territory, from the chapel of São Pedro to the settlement of Crestelo, was once a primitive Castro, which suffered from later Roman colonization.

King Manuel of Portugal issued a later foral on 15 December 1514, while staying in Évora, which raised the settlement status to town and municipal seat.

Owing to local tradition, the chapel of the Sanctuary of Nossa Senhora do Viso, was the first parochial church raised in the parish.